John Wood Atmospheric Gas (Standard) - Manual (Page 2)

2
TABLE OF CONTENTS
Water Heater Safety .............................................................................................................................................................................. 1
Safe Installation, Use and Service ...................................................................................................................................................... 3
Safety Precautions ............................................................................................................................................................................ 3-4
Typical Installation ............................................................................................................................................................................... 5
Installing your Gas Water Heater ..................................................................................................................................................... 6-8
Important Information About Your Water Heater ...................................................................................................................... 6
Consumer Information ............................................................................................................................................................. 6
Consumer Responsibilities ...................................................................................................................................................... 6
Unpacking the Water Heater ................................................................................................................................................... 6
Location Requirements ............................................................................................................................................................ 7
Site Location ............................................................................................................................................................................ 7
Clearances and Accessibility ................................................................................................................................................... 8
Gas Supply ....................................................................................................................................................................................... 9-10
Gas
Requirements .................................................................................................................................................................... 9
Gas Piping ............................................................................................................................................................................... 9
Gas Pressure ........................................................................................................................................................................... 9
Gas Pressure Testing ............................................................................................................................................................... 9
LP Gas Only ........................................................................................................................................................................... 10
Combustion Air and Ventilation ....................................................................................................................................................11-14
Unconfined
Space ...................................................................................................................................................................11
Confined Space ......................................................................................................................................................................11
All Air from Inside the Building ...........................................................................................................................................11-12
All Air from Outdoors .............................................................................................................................................................. 12
Louvers and Grilles ................................................................................................................................................................ 12
Vent Pipe System ............................................................................................................................................................. 12-13
Draft Hood Installation ........................................................................................................................................................... 13
Vent Pipe Size ....................................................................................................................................................................... 13
Vent Connectors .................................................................................................................................................................... 13
Chimney Connection ......................................................................................................................................................... 13-14
Vertical Exhaust Gas Vent ..................................................................................................................................................... 14
Vent Size Verification ............................................................................................................................................................. 14
Water System Piping ..................................................................................................................................................................... 15-17
Piping Installation .............................................................................................................................................................. 15-16
Closed System/Thermal Expansion ....................................................................................................................................... 16
Temperature & Pressure Relief Valve .................................................................................................................................... 16
T&P Relief Valve and Pipe Installation ............................................................................................................................. 16-17
Combination Space Heating/Potable Water System ............................................................................................................. 17
Solar Installation .................................................................................................................................................................... 17
Important Information About this Water Heater .............................................................................................................................. 18
Operating Your Water Heater ....................................................................................................................................................... 19-25
Lighting Instructions .......................................................................................................................................................... 19-20
Checking the Draft ................................................................................................................................................................. 21
Burner Flames ....................................................................................................................................................................... 21
Emergency Shutdown ............................................................................................................................................................ 21
Water Temperature Regulation ......................................................................................................................................... 21-22
Operating the Temperature Control System ........................................................................................................................... 22
Operational Conditions ..................................................................................................................................................... 22-24
Draining and Flushing ............................................................................................................................................................ 24
Routine Preventive Maintenance ........................................................................................................................................... 24
Temperature and Pressure Relief Valve ........................................................................................................................... 24-25
Maintenance of Your Water Heater .............................................................................................................................................. 25-29
Replacement Parts ................................................................................................................................................................ 25
Removing the Burner from the Manifold/Burner Assembly ................................................................................................... 25
Replacing the Pilot / Thermopile Assembly ........................................................................................................................... 26
External Inspection & Cleaning of the Base-Ring Filter ........................................................................................................ 27
Cleaning the Combustion Chamber and Flame-arrestor ....................................................................................................... 27
Replacing the Manifold Burner/Assembly ......................................................................................................................... 27-28
Piezoelectric Igniter System .................................................................................................................................................. 28
Testing the Igniter System ..................................................................................................................................................... 28
Removing and Replacing the Gas Control Valve/Thermostat ............................................................................................... 28
FVIR System Operational Checklist ...................................................................................................................................... 29
Troubleshooting Checklist ........................................................................................................................................................... 29-30
Pilot Light Troubleshooting Flowchart ............................................................................................................................................ 31
Status Light and Diagnostic Code Troubleshooting Chart ....................................................................................................... 32-33
Repair Parts ................................................................................................................................................................................... 34-35
Notes .............................................................................................................................................................................................. 36-37
Warranty .......................................................................................................................................................................................... 38-39